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The CAMEO barium release - E/parallel/ fields over the polar capFour successive thermite barium releases at an altitude of 965 km over polar cap invariant latitudes 84 to 76 deg near magnetic midnight were conducted from the orbiting second stage of the vehicle that launched Nimbus 7; the releases were made as part of the CAMEO (Chemically Active Material Ejected in Orbit) program. This was the first opportunity to observe the behavior of conventional barium release when conducted at orbital velocity in the near-earth magnetic field. The principal unexpected characteristic in the release dynamics was the high, 1.4 to 2.6 km/s, initial Ba(+) expansion velocity relative to an expected velocity of 0.9 km/s. Attention is also given to neutral cloud expansion, initial ion cloud expansion, convective motion, and the characteristics of field-aligned motion. The possibility of measuring parallel electric fields over the polar cap by observing perturbations in the motion of the visible ions is assessed.
Document ID
Document Type
Reprint (Version printed in journal)
Heppner, J. P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Miller, M. L.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Pongratz, M. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smith, G. M.
(California, University Los Alamos Scientific Laboratory, Los Alamos, N. Mex, United States)
Smith, L. L.
(Battelle Pacific Northwest Laboratories Richland, Wash., United States)
Mende, S. B.
(Lockheed Research Laboratories Palo Alto, Calif., United States)
Nath, N. R.
(Computer Science Corp. Silver Spring, Md., United States)
Date Acquired
August 11, 2013
Publication Date
May 1, 1981
Publication Information
Publication: Journal of Geophysical Research
Volume: 86
Subject Category
Accession Number
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